Instructions / Assembly

SPARK PLUG MAINTENANCE

Spark plug type: BPR6ES (NGK) or NHSP LD F7RTC

In order to ensure the engine normal running, gap of the spark plug must be correct and no deposit

around the spark plug.

 Remove the spark plug cap.

 Clear away dirt around the spark plug base.

 Dismantle the spark plug with a spark plug wrench.

 Visually check the spark plug. Clean with a steel brush. If the insulator is damaged, replace the

spark plug instead.

 Measure the spark plug clearance with a feeler. The clearance should be

0.7~0.8mm. If adjustment is necessary, bend the side electrode carefully.

 Check if the spark plug gasket is in good conditions. In order to screw

thread misplace, screw in by hand.

 Screw on the spark plug to the bottom first by hand and then screw in by a

spark plug wrench and compress the gasket.

-- If a new spark plug is used, more twist 1/2 turns after compressing the

gasket.

-- If reinstalling the used spark plug, just more twist 1/8-1/4 turns.

WARNING: Don’t touch the muffler in running and just gasoline engine stopping

stage to avoid burn.

WARNING: The spark plug must be tightened securely, or it may become very hot to

damage the engine.

AIR FILTER MAINTENANCE

A dirty air filter can restrict air flowing into the carburetor. To keep the carburetor in good working

conditions, please service the air filter periodically(clean air filter element after engine running

20h).If operating the engine in extremely dusty area, the job should be done more often.

WARNING: Never clean the air filter element with gasoline or low flash-point

detergents, or explosion may happen.

NOTICE: Never run the engine without an air filter, because air with dirt and dust entering the

engine can speed up the engine wear.

1. Remove the air filter cover off and take the element out.

2. Cleaning:

•For paper filters:

Wash the element with home detergents and warm water (or non-flammable or high flash-point

cleansing solvents) and dry up.

•For foam filters:

Soak in clean engine oil until saturated. Squeeze out excess oil, otherwise, the engine will smoke in

Starting stage.

3. Clean the air filter cover and inner surface with wet cloth, be careful not to allow the dust entering

into the carburetor.

4. Reinstall the element and put the air filter cover on.

Fig.24